Malicious PDF — malware analysis report

Static analysis result for SHA-256 70494ad680652218…

MALICIOUS

PDF

108.3 KB Created: 2021-05-15 09:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62e9196dcaf7dcb76d45dbf99aa02076 SHA-1: 0c267aea32ae3dfecd7d00bceff7f16911ccf671 SHA-256: 70494ad680652218393c0106393fc8592afa0096bf404dfe145a5ba106204a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, indicating a link farm or redirection scheme, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various external PDF files, suggesting a multi-stage attack or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=forgotten+realms+wikia
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/segitovoluta.pdf
    • https://lebetazukuz.weebly.com/uploads/1/3/1/6/131606644/gulotifawed.pdf
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/f1f46b526385d7c.pdf
    • http://nidewopovuwubo.mypressonline.com/scanned_file_sample_download.pdf
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/4c9e4e42.pdf
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcf845bf02cc.pdf
    • https://cdn-cms.f-static.net/uploads/4494668/normal_606be1458adc2.pdf
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/sabajezoj.pdf
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5ff2256f928cb.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/vuzabajugunomusen.pdf
    • http://najelipopusivut.getenjoyment.net/albert_camus_la_peste_gratis.pdf
    • https://cdn-cms.f-static.net/uploads/4465396/normal_60150123bc0b2.pdf
    • https://vataviborabedim.weebly.com/uploads/1/3/4/0/134012391/vigotoduni_kafuxifu_bosinusal.pdf
    • http://luduloze.iblogger.org/lelogipekikum.pdf
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/mojuko_zefaribuguvem_doputekore_rezug.pdf
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff389a971394.pdf
    • http://wamagobegufif.iblogger.org/antibiotic_resistant_bacteria.pdf
    • http://tadidavazutopa.sportsontheweb.net/hernia_ventral_adalah.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_6efac115262e485d80be8d72ede4c09f.pdf?index=true
    • http://sanubexudo.rf.gd/if_i_ran_the_zoo_universal.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_803087ae36d84f9b9b4766f7f5c9fbc5.pdf?index=true
    • http://gupepitasaxisal.epizy.com/xonikuripaxufa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016adb.bin
3de3ae3e5b1fc562fc0d0b079e95c82c75ee404f6e1b1ba2d6558c732ce3caf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADB 5116 bytes
font_01_sfnt_off00017c46.bin
8154df99d88053ef32c5099b895cadd1609c0d7ec24c3f4ac5b4959dec1c33d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C46 11044 bytes

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